A bird's eye view of Hall 3, the home to booths from many of the big-name device makers, including Huawei, LG, Nokia and Samsung.
We're guessing the volume goes up to 11.
It's tough to keep four balls in the air, as this clown found out moments later.
This updated version of Korea Telecom's robot adds a rear projector, seen here, as well as voice recognition.
SK Telecom's rival robot doesn't include a built-in screen or connectivity, instead using any Android phone for both a display and wireless hookup.
The SK Telecom robot, due out later this year, can interact with specially tagged objects, such as this one.
Still more robots.
Behind closed doors, Samsung was said to be showing off a flexible display, among other new technologies.
We asked to have a peek at the flexible display Samsung was said to be showing to potential customers. We even asked nicely, but no dice.
Among the more elaborate meeting rooms, Middle East carrier Qtel Group spared little expense touting its new name Ooredoo, which means "I want."
Hall 2 was home to various meeting rooms where, away from public view, new products get shown and deals get made.
Sony's booth at Mobile World Congress 2013.
A long line to get into Mobile World Congress 2013.
A section of the show floor was devoted to specialized topics, such as mobile payments.
Huawei's booth features, along with its devices, this levitating metal cube feature the company's new "make it possible" tagline.
And what would a trade show be without some good parties. One of the highlights was Google's party at a Barcelona nightclub featuring Florence and the Machine.